[Solved] ASP.Net MVC Error: Could not find specified column in results

I have developed a web application using MVC architecture.

I have create a Form, Submit it and Insert data in MySQL database using ADO.Net in ASP.Net MVC

On the form I have two Textbox:

1. "Name"
2. "Country"

and one DropDownList: "UOR"

This is a Model class on the project

public class PersonModel
{
    [Required]
    [Display(Name = "Name")] 
    public string Name { get; set; }

    [Required]
    [Display(Name = "Country")]
    public string Country { get; set; }

    [Required]
    [Display(Name = "UORID")]
    public string UORID { get; set; }

    [Required]
    [Display(Name = "UOR")]
    public List<SelectListItem> UOR = new List<SelectListItem>();
}

This is a Controller class on the project

    [HttpPost]
    public ActionResult Index(PersonModel person)
    {
        person.UOR = PopulateDropDown(" SELECT * FROM .... ;");

        if (ModelState.IsValid)
        {
            string Name = person.Name;
            string Country = person.Country;

            string constr = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
            using (MySqlConnection con = new MySqlConnection(constr))
            {
                string query = "INSERT INTO Customers(Name, Country) VALUES(@Name, @Country)";

                using (MySqlCommand command = new MySqlCommand(query))
                {
                    command.Connection = con;
                    con.Open();
                    command.Parameters.AddWithValue("@Name", person.Name);
                    command.Parameters.AddWithValue("@Country", person.Country);
                    command.ExecuteNonQuery();
                    con.Close();
                }
            }
        }
        else
        {
            return View(person);
        }

        return View(person);
    }

    [HttpGet]
    public ActionResult Index()
    {
        var personModel = new PersonModel();

        personModel.UOR = PopulateDropDown(" SELECT * FROM .... ; ");

        return View(personModel);
    }

    private static List<SelectListItem> PopulateDropDown(string query, string textColumn, string valueColumn)
    {
        List<SelectListItem> items = new List<SelectListItem>();
        string constr = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        using (MySqlConnection con = new MySqlConnection(constr))
        {
            using (MySqlCommand cmd = new MySqlCommand(query))
            {
                cmd.Connection = con;
                con.Open();
                using (MySqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {
                        items.Add(new SelectListItem
                        {
                            Text = sdr[textColumn].ToString(),
                            Value = sdr[valueColumn].ToString()
                        });
                    }
                }
                con.Close();
            }
        }

        return items;
    }

I have error Could not find specified column in results: UOR when try insert data in MySQL database, on this part of Controller class

    private static List<SelectListItem> PopulateDropDown(string query, string textColumn, string valueColumn)
    {
        List<SelectListItem> items = new List<SelectListItem>();
        string constr = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        using (MySqlConnection con = new MySqlConnection(constr))
        {
            using (MySqlCommand cmd = new MySqlCommand(query))
            {
                cmd.Connection = con;
                con.Open();
                using (MySqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {
                        items.Add(new SelectListItem
                        {
                            Text = sdr[textColumn].ToString(),
                            Value = sdr[valueColumn].ToString()
                        });
                    }
                }
                con.Close();
            }
        }

        return items;
    }